Method for watermarking a three dimensional object and method for obtaining a payload from a three dimensional object

Abstract

A method for watermarking a three-dimensional object is disclosed. The watermarking method comprises computing shape descriptor of a local neighborhood of a current vertex among the plurality of vertices of the three-dimensional object; obtaining a target shape descriptor from the shape descriptor using a quantization grid associated with a watermark payload; and modifying said local neighborhood wherein a position of at least one vertex of said local neighborhood is modified such that a shape descriptor of said modified local neighborhood is close to said target shape descriptor and wherein said current vertex is not modified.A method for obtaining payload from a three-dimensional object, a 3D object carrying a watermark and devices implementing the disclosed methods are further disclosed.

Description

TECHNICAL FIELD[0001]In the following, watermarking of three-dimensional object is addressed. Specifically, a method for watermarking a three-dimensional object and a method for obtaining a payload from a three-dimensional object are disclosed. The corresponding 3D object, devices and computer program are also disclosed.BACKGROUND ART[0002]This section is intended to introduce the reader to various aspects of art, which may be related to various aspects of the present principles that are described and / or claimed below. This discussion is believed to be helpful in providing the reader with background information to facilitate a better understanding of the various aspects of the present principles. Accordingly, it should be understood that these statements are to be read in this light, and not as admissions of prior art.[0003]The feature points of a surface mesh, wherein a 3D object is represented by such mesh, are defined as the locations where the parameters of a fitted local model ...

AI Technical Summary

Benefits of technology

The patent describes a method for modifying a local area around a position in a 3D object to create a unique signature that is easily recognizable and not embedded in the whole model. This makes the object easier to identify and track, and improves its resistance to cropping. The method involves adding a small displacement to the position of vertices in the local area to minimize distortion and ensure a close match with the target signature. This can be done for multiple landmark points to improve the reliability of the watermark.

Problems solved by technology

However defining a cropping-invariant partitioning mechanism for 3D meshes represents a complex task.

However, at the detection, the technique of Barni raises the issue of synchronizing the spherical pseudo-random bumped surface with the low resolution model.

First the survey at most discloses perspective in the domain of watermarking with shape descriptor and secondly the survey fails to disclose a 3D-watermarking method on based on arbitrarily-chosen vertices.

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